Doesn't possible to install when connection is out ? Because, it will
be possible that some users don't have Internet connection. My users live Democratic Republic of Congo. Internet isn't used all time.
An internet connection may be required by your package if you checked the "Run only if an active Internet connection is found" option from the "Launch Conditions" page.
If this is not the case, please send me the .AIP (project file) and a verbose log of the installation to support at advancedinstaller dot com, so I can investigate them.